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    <title>IFE task 25</title>
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<fieldset>
    <legend>树形组件</legend>
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    <button type="button">搜索</button>
    <div class="tree-area">
        <div class="root">
            <label><i class="icon-to-bottom"></i><span class="title">前端程序猿的修炼之路</span><i class="icon-add"></i><i class="icon-del"></i></label>
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